Steve,
Have you considered a hot wire gun? This could be the thingie that you seek. Two electrodes with a piano like hot wire between them that is obviously hot (set the thermostat) and leaves a nice clean cut and is quick. This is somewhat temperature dependent (as well as operator) as to time taken. Just an idea!
Cheers,
Robin Badcock
> Hi Pete
>
> I let the supplier/installer know my opinion and presumably he has
contacted
> his client; I will find if there has been an outcome.
> Removing the bead will be a pain. If the need arises, the first step is to
> find out what others have done; may even have some fun and ask the client
> how he wants it done. If we have no luck will try cutting off the bead
with
> some sort of sharp edged thingie, perhaps some form of pneumatic chisel
with
> guides. HDPE hot works quite nicely but the bead would cool before we
> finished hot trimming it. Dry grinding just makes a big mess; wet grinding
> may work but would be very slow.
>
> I suspect common sense will prevail, but I have been wrong on this
> assumption before.
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: Pete's Mail [mailto:peteburn@optonline.net]
> Sent: Tuesday, May 18, 2004 12:31 PM
> To: <a href="/group/PipingDesign/post?postID=QVzYKuWKlv0NFyY1lK1GLIs5PWZUx3G0VSZRHJLx-T1txwHlkzo5bmai8rtUAOzLIZwnCKCuUdNhSjlnbcgoIHoDHts">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] Re: Butt Welded HDPE Pipe
>
>
> Steve
> I've been following the bead situation. I just want to hear how you
resolve
> it. Don't leave us hanging. I'm curious how you are going to get rid of it
> too.
>
> Pete
> ----- Original Message -----
> From: Steve McKenzie
> To: <a href="/group/PipingDesign/post?postID=QVzYKuWKlv0NFyY1lK1GLIs5PWZUx3G0VSZRHJLx-T1txwHlkzo5bmai8rtUAOzLIZwnCKCuUdNhSjlnbcgoIHoDHts">PipingDesign@yahoogroups.com</a>
> Sent: Monday, May 17, 2004 2:39 AM
> Subject: RE: [PipingDesign] Re: Butt Welded HDPE Pipe
>
>
> Thanks Tony
> I reckon the Re is about 2 million so there you have it. Surprised the
> laminar transition would have such an effect. Must check it out. One
> day.............
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: Tony Paulin [mailto:tony@paulin.com]
> Sent: Monday, May 17, 2004 5:01 PM
> To: <a href="/group/PipingDesign/post?postID=QVzYKuWKlv0NFyY1lK1GLIs5PWZUx3G0VSZRHJLx-T1txwHlkzo5bmai8rtUAOzLIZwnCKCuUdNhSjlnbcgoIHoDHts">PipingDesign@yahoogroups.com</a>
> Subject: [PipingDesign] Re: Butt Welded HDPE Pipe
>
>
> Re: Weld beads and pipeline friction
>
> Hans Bos passed on the following comment I thought might be helpful:
>
> Whether it is important or not depends on the Reynolds number. If flow
is
> low and the design Reynolds number is in the laminar tubulence
transition
> the bead could make the boundary layer change to turbulent and then the
> friction increases. If the flow is turbulent anyway the bead should
hardly
> be of importance.
>
> Tony
>
> -----Original Message-----
> From: Steve McKenzie [mailto:mechproj@xtra.co.nz]
> Sent: Friday, May 14, 2004 4:35 PM
> To: <a href="/group/PipingDesign/post?postID=QVzYKuWKlv0NFyY1lK1GLIs5PWZUx3G0VSZRHJLx-T1txwHlkzo5bmai8rtUAOzLIZwnCKCuUdNhSjlnbcgoIHoDHts">PipingDesign@yahoogroups.com</a>
> Subject: [PipingDesign] Butt Welded HDPE Pipe - Friction Loss Due To
> Weld Beads
>
>
> Gents
> an HDPE supplier/installer has been asked by his client to debead the
> weld inside an HDPE pipeline. The reason given is thought to be
> increased pipeline friction due to the weld beads.
> The line is 1400mm OD (18m lengths), 56mm wall and the beads are said
> to be 10mm high (which seems a little low to me). I did a few rough
> sums treating the weld as an orifice plate. The outcome was that the
> weld friction loss is less than 3% of the pipe friction loss, which
> didnt surprise me.
> I am looking for an authoritative (quotable) study/reference on this
> subject.
> Any leads?
> Thanks
>
> Steve
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
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